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Share Capital and Employee Compensation Plans - Option Activity (Details)
 12 Months Ended
Dec. 31, 2024
shares
$ / shares
Dec. 31, 2023
shares
$ / shares
Disclosure of share-based payment arrangements [Abstract]    
Share options outstanding, beginning (shares) | shares 513,200 377,000.0
Granted (shares) | shares   167,100
Exercised (shares) | shares (100,900)  
Expired (shares) | shares   (14,400)
Forfeited (shares) | shares (15,900) (16,500)
Share options outstanding, ending (shares) | shares 396,400 513,200
Outstanding, beginning of period (CAD$ per share) | $ / shares $ 22.32 $ 23.01
Granted (CAD$ per share) | $ / shares   21.18
Exercised (CAD$ per share) | $ / shares 20.07  
Expired (CAD$ per share) | $ / shares   23.61
Forfeited (CAD$ per share) | $ / shares 22.25 25.39
Outstanding, end of period (CAD$ per share) | $ / shares $ 22.90 $ 22.32